Mathematics – Logic
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.208..575c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 208, June 1, 1984, p. 575-588.
Mathematics
Logic
53
Comets, Interstellar Matter, Molecular Clouds, Planetary Evolution, Solar System, Stellar Evolution, Cosmology, Orion Nebula, Protoplanets, Comets, Capture, Clouds, Dynamics, Planets, Formation, Analysis, Theoretical Studies, Density, Planetesimals, Source, Isotopes, Anomalies, Samples, Meteorite, Samples, Oort Cloud, Origin
Scientific paper
The process is analysed whereby successive clouds of comets are captured into and ejected from the Solar System during spiral arm passages in accord with the theory of episodic terrestrial catastrophism. Geophysical and biological phenomena are thereby expected to reveal Galactic periodicities, including cycles of 50 or 100 Myr, and 25 - 30 Myr. A large number density of comets in giant molecular clouds is implied, indicating that the aggregation of planetesimals to form stars and planets could well take place in compact systems of near zero energy. It is shown that the source of such systems of planetesimals may be inferred from studies to isotope anomalies in cometary and meteoritic material.
Clube V. M. S.
Napier Mcd. W.
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